The Science of Spice

Chilli heat is a trick. Capsaicin — the active compound in chilli peppers — doesn't cause actual tissue damage (at normal eating levels). It convinces your body that it's being burned.

How capsaicin works

Capsaicin binds to TRPV1 receptors — pain receptors that normally respond to heat above 43°C. When capsaicin binds to these receptors, they fire as if you're experiencing genuine heat.

Your brain receives the signal and responds accordingly: increased heart rate, sweating, endorphin release. The burning sensation is neurological, not physical.

Why we love it

The endorphin response is key. Your body treats capsaicin as a mild threat and releases natural painkillers. Regular chilli eaters gradually build a stronger endorphin response — and the experience becomes genuinely pleasurable.

This is why chilli tolerance is built over time. You're not just getting used to pain; you're building a stronger reward response.

Capsaicin in the body

• Mouth: Primary hit. Most TRPV1 receptors in the soft tissues of the mouth and tongue.
• Throat and oesophagus: Secondary burn as you swallow.
• Stomach: Can cause discomfort in sensitive individuals or at extreme concentrations.
• Hands and eyes: Capsaicin transfers on contact. Always wash hands; never touch eyes.

Cooling capsaicin

Water doesn't work — capsaicin is fat-soluble, not water-soluble. Effective remedies:

• Dairy: Casein protein in milk binds to and removes capsaicin. Full-fat dairy works best.
• Sugar: High concentration can reduce perception.
• Starchy foods: Bread and rice coat and absorb capsaicin.
• Alcohol: Dissolves capsaicin — effective but slow.

Capsaicin's real-world uses

Beyond food: capsaicin is used in topical pain relief products, pepper spray, and is being researched for cancer treatment and metabolic health.